In Back To The Future, Marty McFly accidentally travels back to 1955, where he crashes into Old Man Peabody's barn.
Peabody and his family are startled by Marty, whose hazmat suit and DeLorean make it look like he's an alien from another planet.
This is confirmed by Old Man Peabody Jr., who holds up a sci-fi pulp mag with a cover featuring an invading alien who's dressed just like Marty.
For the record, this is the front & back cover of the kid's Tales From Space mag. On the back there's a colorful ad for an Official Red Rider Carbine Air Rifle...
Welp, that makes it official! Back To The Future and A Christmas Story both take place in the same cinematic universe!
I can't wait to see Doc Brown interact with Ralphie's Old Man!